20331221479 has 2 divisors, whose sum is σ = 20331221480. Its totient is φ = 20331221478.

The previous prime is 20331221423. The next prime is 20331221527. The reversal of 20331221479 is 97412213302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20331221479 - 2¹¹ = 20331219431 is a prime.

It is a super-3 number, since 3×20331221479³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331227479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165610739 + 10165610740.

It is an arithmetic number, because the mean of its divisors is an integer number (10165610740).

Almost surely, 2^20331221479 is an apocalyptic number.

20331221479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331221479 is an equidigital number, since it uses as much as digits as its factorization.

20331221479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 20331221479 in words is "twenty billion, three hundred thirty-one million, two hundred twenty-one thousand, four hundred seventy-nine".